One's purple in bed, if such frolics end in angina (7)
I believe the answer is:
fuchsia
'one's purple in bed' is the definition.
(purple flower that might be in a flower bed)
'if such frolics end in angina' is the wordplay.
'frolics' indicates an anagram (I've seen 'frolic' mean this).
'end in' says to take the final letters.
The final letter of 'angina' is 'a'.
'if'+'such'='ifsuch'
'ifsuch' with letters rearranged gives 'fuchsi'.
'fuchsi'+'a'='FUCHSIA'
(Other definitions for fuchsia that I've seen before include "Vivid purplish-red" , "Ornamental flowering plant - reddish-purple" , "Common garden plant" , "Purplish-red colour" , "Colourful flower, if such a mix is possible" .)